摘要
建立硝酸提取-微波消解-电感耦合等离子质谱法(ICP-MS)同时测定茶叶中Pb、Cd、As、Cu、Zn、Cr、Co、Mo等16种元素的最佳测定方法。茶叶标准物质GBW10052a(GSB-30a)经微波消解处理后,利用标准曲线法结合在线加入内标溶液,在碰撞模式下分别用外标法和标准加入法同时测定16种元素含量,研究茶叶基体对待测元素定量分析的影响。结果表明,该方法能同时测定多种元素,线性范围广,所测元素相关系数R^(2)为0.998~1.000,3个浓度水平添加回收率为88.56%~120.24%,相对标准偏差在0.72%~2.67%,方法检出限0.001~0.200 mg·kg^(-1),标准加入法能有效消除基体干扰影响,可用于日常茶叶样品中重金属元素的检测。
Establish the optimal determination method for 16 elements including Pb,Cd,As,Cu,Zn,Cr,Co,Mo in tea by nitric acid extraction microwave digestion inductively coupled plasma mass spectrometry(ICP-MS).After microwave digestion of the tea standard substance GBW10052a(GSB-30a),the standard curve method combined with online addition of internal standard solution was used to simultaneously determine the content of 16 elements in collision mode using external standard method and standard addition method.The influence of the tea matrix on the quantitative analysis of the measured elements was studied.The results showed that this method can simultaneously determine multiple elements,with a wide linear range.The correlation coefficient R^(2) of the measured elements is 0.998-1.000.The recovery rates of the three concentration levels added are 88.56%-120.24%,with a relative standard deviation of 0.72%-2.67%.The detection limit of the method is 0.001-0.200 mg·kg^(-1).The standard addition method can effectively eliminate the interference of the matrix and can be used for the detection of heavy metal elements in daily tea samples.
作者
宁建美
徐晓安
唐仕琴
潘瑛洁
NING Jianmei;XU Xiaoan;TANG Shiqin;PAN Yingjie(Agriculture and Rural Bureau of Songyang County,Songyang 323400,Zhejiang)
出处
《浙江农业科学》
2024年第6期1457-1462,共6页
Journal of Zhejiang Agricultural Sciences
基金
县级食品检验检测资源整合建设项目。
关键词
茶叶
硝酸
电感耦合等离子质谱法
微波
消解
tea
nitric acid
inductively coupled plasma mass spectrometry
microwave
digestion
